Micrometrically adjustable tool arm



y c. H. wERTH MICROMETRICALLY ADJUSTABLE TOOL ARM June 22, 1965 4 Sheets-Sheet 1 Filed Sept. 17, 1962 /umw CAMWERTH June 22, 1965 c. H. wER'rH 3,190,152

MICROMETRICALLY ADJUSTABLE TOOL ARM Filed Sept. 17, 1962 4 Sheets-Sheet 2' Il i @@26 /6 v d 47,1

,2 F/G. l www CHRI. luf/ER 7H Jun 22, 1965 c. H. WERTH 3,190,152

MICROMETRICALLY ADJUSTABLE TOOL ARM Filed sept. 17.' 1962 4 Sheets-Sheet 5 7/ 70 5 88 I eab 87 n" a2 63 8/ aaa F/G. /O

l gayj' 8e INVENTOR.

maan/mm June 22, 1965 c. H.'w1:RTH

MICROMETRIGALLY ADJUSTABLE TOOL ARM 4 sneets-snet 4 2/ w. a SEE? m. Q @l 3,190,1`l52 MICROMETRICALLY ADJUSTABLE TODL ARM Carl H. Werth, 818 Thurman St., Saginaw, Mich. Filed Sept. 17, 1962, Ser. No. 223,886 16 Claims. (Cl. 77-58) which is flexible or deformable underload to permit adjustment of the position of the tool bit in the manner iuldicated. Preferably, the tool arm mounts indicators or the like to measure the adjustment which is made. The purpose of the movement lmay be to reach a finely adjusted position or to compensate for tool wear. Tool arms on the market today are generally constructed with the tool arm mounted to pivot about a pivot post. This construction creates certain `problems believed attributable to the vfact that one part must journal Ythe other and consequently the fit of the parts cannot be so tight as to ,frictionally restrict their movement. The necessary `clearance or looseness between theftool arm and pivot post or a bushing and pivot post in such constructions necessarily affects the accuracy of any measured adjustment which it is desiredto make.` 4With wear of the various parts, inaccuracies are, of course, compounded.

Further, with this loosenessthe various parts can be moved relatively, and their position relative to one another changed, by the application of external forces which may 'move the parts axially back and forth, laterally sideways, or up and down. Since in many cases the parts are initially machined to provide a minimum clearance to overcome the disadvantages mentioned, sometimes galling and seizing results and particularly when dirt gets into the pivot post assembly. A. p

A prime object of the invention is to provide a very practical tool arm which can be used ina variety of machining operations, or a combination of such operations, on lathes, boring machines and the like, to substantially reduce the time required for tool adjustments which can, of course, be very costly in high production operations.

Another object of the present invention is to` provide Vsuch a tool arm which in its construction avoids the use of a pivot post and employs instead a deformable member which permits micrometric adjustment in both theV axial and radial directions to be accomplished readily by a machinist of ordinary skill.

A further object of the invention is to provide a tool arm assembly which can be constructed without the need of holding relatively movable parts to close tolerances which tax the skills ofthe Vbest machinists.

Another object of the inventionY is to provide a tool arm construction in which Wear, and galling or seizing of the parts, are not problemsand the tool arm is posi- 4tively held from inadvertent displacement by external forces in all directions, axial and lateral forces applied to the arm being fully resisted by control screw members United states Patent o ice and a tool arm which with built in hold-down and keeperA members is virtually damage proof if disassembled by inexperienced personnel.

` Other objects and advantages of the invention will be pointed out specifically or will become apparent Yfrom the following description when it is considered in conjunction with the appended claims and accompanying drawings, in which:

FIGURE l is a sectional, longitudinal elevational view;

FIGURE 2 is a top plan view thereof with the broken lines illustrating a tool holder and tool mounted in position on the tool arm assembly;

FIGURE 3 is an enlarged, fragmentary, top plan view showing the exible bar, which is employed, in preloaded operative condition, the top plate and certain other parts of the mechanism being omitted from the view for purposes of clarity;

FIGURE 4 is a similarly enlarged, end elevational View of the flexible Vbar only;

FIGURE 5 is a similarly enlarged, top plan-view of the exible bar, illustrating the manner in which it is formed;

FIGUREV 6 is a similarly enlarged, fragmentary, top 4plan view of the bar, illustrating in a considerably exaggerated mannerV the deformation or deflection which occurs when a radial adjustment is made inthe direction of the arrow;

FIGURE 7 isa similarly enlarged, fragmentary, top plan view of the flexible bar illustrating in an exaggerated manner the deformation which occurs when an axial adjustment is made in the direction of the arrow;

FIGURE 8 is a greatly enlarged, transverse, sectional View taken on the line 8 8 of FIGURE 9, illustrating the lever device employed to transmit radial or lateral movements to a radial movement indicating device;

" FIGURE 9 is a top plan View of the lever device; f

FIGURE 10 is a top plan view showing the device in an alternate position; l

FIGURE 11 is a top plan view of another form of exible bar used for tool adjustment in a radial direction only;

FIGURE 12 is a side elevational view illustrating another embodiment of the invention in which vertical `movement of a liexible bar section is obtained;

FIGURE 13 is a top plan view thereof; and FIGURE 14 is an end elevational view thereof. Y

Referring now more particularly to the accompanying drawingsin which preferredV embodiments of the invention only are shown, a numeral 10 generally refers to a tooling plate which is mounted in iixed position on the base or bed of a machine tool, such as a boring machine,

`in any suitable manner adjacent the workpiece W which and lifting forces being resisted by positive structural Y members.

Another object of the invention is to provide a tool arm assembly in which slip stick, the tendency for the movable part to stick until its inertia is overcome, is avoided.

A further object of the invention is to design a more rigid tool arm incorporating a preloaded exible bar,

is mounted in a chuck or the ,like onthe spindle of the machine. YMounted on the tooling plate 10 by means of suitable cap screws 11 is a deectable or deformable bar VVor plate 12, tooling plate 10 having threaded screw-receiving openings 13 and bar 12 having counterbored openings,` 14 in its central portion 12a asY shown. As shown particularly in FIGURES 3 and 5-7, the bar 12,which Y is formed of a suitable spring steel or other rigid and resilient material, is provided at its front end with a pair of transversely extending, narrow, elongated openings 1S joined by a U-shaped slot 16 which substautiallyisolates the rigidly secured central portion or section 12a of the bar 12 from the outer portionpor section thereof. The ends of the openings 15,`which are curvilinear as shown at 15a, extend suiliciently close to the corresponding curvilinear side portions 12b of the bar 12 that relatively thin, liexible portions 17 are formed at the front corner portions-of the bar and the openings 15 are also closely spaced from the front edge of the bar 12 to form reed portions 12c. It will be noted that the portion 18 of the bar Patented June 22, 1965V between the openings is somewhat wider and is resistg.

f 4 n tool T forwardly, the axial range of adjustment preferred being about .04010 .050 of an inch. Y

Also provided in the block 52 is a laterally or transversely extending adjusting screw. 59 which Yis received sure is exertedy by thev cap screws 11 so that the bar 12i's. f u

preloaded verticallyl when it is assembled to the tool plate 10. Y

YWhile the center line of the tool holder H'for the tool T is alongA the center linea of the bar 12, .the top plate 23 on which it is supported is secured to the outer defiectable portions of the bar 12 by cap screws 24 (FIGURE 1) extending-into openings 25 in the top plate 23. and through,

to threaded openings 26 in the outerportions of they bar 12. Dowel openings 27 are also provided in the bar 12 to .tainednot only by the dowels 55.-.but by cap screws` 60a,Y

receive do'wel pins 28 whichextend through openings 29,.

in the top plate 23 to yassure precise alignment.k The.. top plate 23 is longitudinally grooved as at 23a so Vas to provide side rwall., portions 23b to. snuglyv receive the Ytool holder H. Provided in the under side of top plate 23 isa transverse groove 30 4tofreceive a hold-down-bar 31 which is secured to the central bar portion 12a by cap screws k32 extending fromcounterbored openings 33 in theV bar 31 into :threaded openings 34 `provided in therbarV portion. A12m-The hold-downibar 31 extends across the sides of the Uf-shaped slot 16 to overlie the outer deiiectable por- Within the bifurcated portionV 23C of plate 23, ytheV Screw` 59 extending through a threaded opening 60 lprovided in the block 52.Y The screw 59 is snugly received within the bifurcated portion 23ev and abuts the. sideV walls thereof so that axial adjustment in either direction will swing the tool holderl H .and tool T- laterally or radially relative. to the workpiece Wg The position `of the block 52 isnmainas willbecome apparent.

Preferably, standardindicators 61 -and 62 .will heemployed Vto measure the axial and radial movement ofthe tool holder H and tool T clamped therein. The indicator 61 can be,supportedby van indicator. support .block 63 1 which Yis fixed to thetooling plateV 10v in anysuitable man ner, kas with cap screws 64 extending into threaded open- Y ings 65 in the YtoolingV plate 10.- .Provided in the block 63, which through screwsr 60a secures the. block-52,and axial alignment'withV the threaded opening .57 in-block l 52 isa bore .66l havingabushingf' tightly receiving the split sleeve 68 .ofthe indicator 61. Indicator-61 is preferably a standard Federal C-f-K ilat backV and splitsleeve v Yiridicatorwhichhas its reciprocable, spring returned plungtions of the bar 12 as shown in FIGURE 2 and effectively holds the entirebarV 12 down against the 'toolingplate 1t]` without interfering with-its flexing movement. To secure the tool holder H rigidly in the groove 23a, angularly dis-V posed hold-down bolts (not shown) extend through angularly extending openings in the. tool holderH and aligned Y openings 35 in the Vtop plate 23.

Alsoprovided onthe toolholder H is'the usual locating bolt 38, which is adapted to abut against a locator bolt 39 carried kby an indicator housinggenerally designated .40

which isV received Within a transverse groove 41jprovidedin the upper face of the top plate 23. The indicator housing includes a bottom wallj40a, side walls 4Gb and 40C,

a front wall 40d, and a top 'wall 4de.k The top wall,40e and bottom wall 40a are bored as at 42 and 43, respectively, to Vreceive'a bolt'44 which.alsdextendsthrough an opening 45fin top plate 23 and isthreaded into an opening 46'in the central portion 12a of bar 12. Openings 42, 43,`

er 69. normally .depresseda predetermined distance by `the adjusting screw 5 6.,l Y;

The indicator 62 :is preferably aFederalVC--K screw bracket. indicator! which has its depressable, spring returned plunger 7tlrd`epressedby atwo-part bell crank lever f,

assemlby V'71,` asshown .in FIGURE 2.- An indicator mounting post72 extending throughan enlarged opening 73 in thetop plate 23 is bored asat 74 to receive the shank portion175 of the .indicator 62 whichseats on a capscrew 76 provided to secure Ythe post 72'iii-position,-1the4 cap Vscrew 76 .extending down intoV a threaded opening. 77 prio- .vided vin-the tooling plate 10.:. 4An access `s lot 78 is pro-` Y' Vvidedfin .plate 23V so thata Yset screw 79 extending into a, threaded opening 80A in the post 72 Vcan be employedto iix the indicator 62 in position TheV bell crank lever assembly 71, Which'will presently be described in detail, is

Y hiiigedfby a leaf spring 81 to `an arm 82 having a split ring and 45 are suiiciently` enlarged to Vpermit movement of the housing 40 and plate 25 in an 'axial and radialY direction relative to bolt 44 which is not tightly clamped and does not restrict such movement. f

table'portion of bar 12." A cap screw y49 provided inl a 5U It will be seen that the bar 12 atits rear end is recessedkk as at .47 to receive a keeper disk 48 overlying the rear.

portion of the bolted down section 12aof therbar 12, which Y Y accordinglyprevents downward movement of the deec.

countersunk opening 50 inl thepkeeper plate48 extends. down into a threaded opening 51' in the outersectionY of the bar. 12, .as shown. Y Y f f e Mounted on the tooling plate 10 immediately to the rear of top plate 423 is a block member 52whichhas` openings 53 communicating with openings 54 in the toolfplate 10 to receive dowel pins 55 which yalignthe Vblock'52.` An adjustingscrew 56 is received in an axially extending threaded opening 57 in block 52 and centrally engages the bifurcated portion 23C. of the'rear end ofthe plate 23,- as shown, the screw 561at its front end extending through a preload ring 58 which is of greater zthickness thanthe space maintained between the rear end of plate 23- `and front face of block 52 when the. deviceis Vin operative condition to preload the Vplate 23, and thereby` the tool holderV H, ina forward direction. Preferably, thering 58 is .O10 to `.015 of an inch greater `inthickness thanthe width of the space mentionedwhen the screw 56 is in Voperating .rearmost position. Clearly, .movement `of Vthe screw 56 forwardly operates to move the tool holder H and URE 8. To hold the members y83 and 85 `in assembled .Y relation, a keeper plate`87 having adownwardly dependsocket portion .82a which clamps around'the indicator plunger housing. and issecured byclamprscrew V82C as shown... 'Y l .Y

'Aswill be seen,`the bell crank assembly 711(EIGURES 8-10 particularly) is adjustable in axial length rto permit radial movement a'eadingsto be 4read directly on the dial of the indicator f62even though .tool holders of varying length are employed.V The assembly 71 is made up of a member 83 whichis generally cruciform -in cross-sectionV and includes anengaging'tip portion 83a which. the spring v 81 Amaintains in engagement with a trib 84 provided on .the one side wall 4Gb ofthe indicator housing 40 throughout the range of movement of the tool arm. The memberr S5 whichrengages vthevplunger 70 ofthe indicator 62 and is aixed to spring yS1 .is grooved in a longitudinal direc.-

tion, as at.86 (see FIGURE 8), to receive oneof the' opposite keys `t3c.and 83h providedon member;V 873,` de-p pendent on the position of the tool *iholder H,`the key or spline 83]; being shown receivedin thel groove l86 in FIG- ent ange 87a is drilled asY at187b to Yreceive a screwtSS .which Ais Vthreaded down into an opening `89'iin member 85.-

-It rwill be seen .in vFIGUR-ESC! andY 10y that the yengaging A surface y83a is forwardly fdisposed to provide ade'vice, of

extended yrange linV which thetool holder -canbe quite a bit shorter in lengt-h, for instance.V The screw -88 can be removedY and keeper'plate87 swung away from an over.-

lying position :with respectto. member 83'so fth'at memberA 83 can beturned 'end forrend and inverted. vWhenthis `adjustment is made, the member 83C isy received in the groove 86 and the'engaging surface 83ais'rearwardly disposed. Because of this unique arrangement, the dial indicator can register radial movement readings of the tool tip at a workpiece with tool holders H of somewhat varying length, for instance, from 1.8 inches to 5 inches, the keeper plate 87 clamping lthe member 83 in an adjusted position in which there is a 2:1 ratio in the distance from the tool tip to the line -b in FIGURE 3 and in the distance fromy line b -to tip 83a.

`Provided to protect the indicator apparatus and keep dirt and other foreign matter out of the operating elements of the tool armis a cover IC having top and side Walls, -which is hinged as at r90 to the indicator support plate 63. The cover V89 is preferably made up ofa transparent material so that indicatorsland 62 can `be read with the cover closed and, as lshown in FIGURE 1, a knob 91 is provided to facilitate liftingof the cover so that there is access to Ithe adjusting screws 56 and 59.

Preferably, the plate or bar 12'is used in a preloaded condition.` In FIGURE 3, `for instance, considering only the bar 12, :it will be noted thatthe slots extend transvers'ely, instead of angularlyl as in IFIGURE 5, for eX- ample. Initially, as machined, the slots 1S extend transversely. `To condition the ba-r 12, a wedge 92 is inserted in .the rear portion of slot 16, as shown in FIGURE 5, to deformV the bar in the manner illustrated. Then the deected bar `12, with wedge 92 in position, is passed into a heat treat furnaceand the met-al is set in the `shape inV which itis shown in FIGURE 5 Vso that it substantially remains in this condition when wedge 921is removed. When the bar 12 is used initially, the adjusting screw 56 is moved forwardlyuntil the bar 12 assumes -t-he position in which it is shown in FIGURE 3. In this condition the bar 12 is preloaded and the slip stick eiect is avoided. With'the indicator dial 61 set to zero at this point, the tlexing of the bar -12 in its range of operation is from the position in which .it is shown in FIGURE 3 toward the somewhat exaggeratedposition inwhich it is shown in FIGURE 7. Actually, theV workingrange is between .040 to .050 and .the rather extreme position shown in FIGURE 7 for purposes of illustration isnever reached.

F or purposes of explaining Ithe operation of the tool arm assembly it will be assumed .that there has been wear of the tool to the extent that tool holder T must |be moved forwardly .010 to perform a facing. operation or the like on the workpiece W. The adjusting screw 56 is turned in a direction to move the top plate 23 forwardly and since the top plate 23 is xed to the transversely outer side portions of the bar 12 these portions are moved forwardly relative to the central portion 12a so that deformation in the manner of FIGURE 7 occurs. As the adjusting screw 56 moves forwardly t-he plunger 69 of the indicator is urged outwardly by the indicator spring and the adjustment forwardly is discontinued when thel dial of the indictor 61 indicates that a forward movement of .010 has occurred.

'Ihe adjustment of screw 59 toV compensate for tool wear radially is similarly accomplished. 'Fi-rst of all, the member 83 is positioned to obtain the 2 to 1 ratio in distances previously mentioned, so that the indicatorV 62 will yread directly. In the operation of adjustment screw 59 to move the 'tool T radially outwardly, in the direction x in FIGUR-E 6, for instance, the adjusting screw is turned in a direction to bear against the surface zin FIGURE 2. This tendsto deform the bar to theV condition indicated in FIGURE 6 and to move the rib 84 toward the surface 83a and fur-ther depress plunger 70.4 The adjustment of screw 59 is continued until the desired movement has been effected as indicated by t-he movement of the indicator pointer. The indicator could, of course, be used to measure movement in the opposite direction, with member 85 then permitting the indicator plunger 70 to move outwardly. The zero position of the indicator dial would have to be set initially with the plunger 70 moved inwardly a suicient distance to provide the range desired;

6 Because the hinge spring 81 is loaded to keep the surface `83a in engagement with rib y84 at all times, the member 85 moves away from the plunger 70, and the indicator spring will move the plunger 70 outwardly.

In FIGURE 11 a modified sex-ibi@ bar 12 is shown which is useful when there is to be adjustment in a radial direction only. In this case the exible bar 12, identical numerals being used to identify identical parts, includes a pa-ir of circular bores 92 at its front end connect-ing with the U-shaped slit 16 inplace of the former relatively elongated slots 15. The tlexing are-avis then the areas formed between the bores 92 vand the fron-t of the bar and radial -adjustment of Ithe tool holder can be accomplished in the manner described previously. In this construction, which is otherwise identical, no axially adjustable screw 56 or indicator 61 is employed. Y

In FIGURES 12-14 a vertically adjustable tool holder is illustrated and for purposes of convenience similar parts are identified by the same numbers as previously except that :the numbers are primed. In FIGURE l2 the ilexible bar 12' is shown as having upper and lower portions 93 and 94, respectively, separated kby a .slot 95 which terminates nearthe frontend of .the tdexible ybar 12(v in a bore portion-96. lThe lower portion 9,4,is fixed to the tooling plate 10' in any suitable manner, as with socket head cap screws 11', and the portion 93 can be deflected in a vertical direction relative 'to the portion `94, portion 93 being axially recessed as at 97 to snugly accommodate the -toolholder H which mounts tool T'. A block 98 secured on Vportion `93 by caprscrews y,99 has 'a central threaded opening 1007mounting a threaded locating stud 101rfor the holder H.

Provided in a counterbored opening 102 in exible bar portion 93 Vand extending into a threaded opening 103 in bar portion 94 is an adjusting screw 104 which is grooved as at 105 to accommodate an O-ring 106 which keeps dirt and other foreign matter out of the assembly. Coil spring 107 mounted in aligned openings 108 and 109 in the 'sections 93and `94, respectively, tends to bias theV portion 93 upwardly, away from the portion 94, and thus to preload the section 93. To measure the vertical adjustment of portion 93, a standard indicator 110 of the type previously mentioned has a mounting extension 11041 pivotally mounted as at 111 on a bracket 112 which can be secured by cap screws .113. The bracket 112 pivotally mounts (as at 112a) a top portion 112bhavingV an opening 114 for receiving the one part of the indicator, and the depressable spring ,returned plunger 115 of the indicator engages a stud 116 which is threaded into the portion 93` of the ilexible bar as at 117 and is secured by a half nut 118.

If the tool holder H is to be adjusted upwardly, the parts are initially set so that the plunger 115 of the indicator 110 is only slightly depressed and the indicator dial will be set at zero. Obviously, the parts can also be set to provide a downward adjustment and a measurement thereof. In this situation the plunger 115 would initially be depressed by stud 116 a sufficient distance sothat its spring biased return would provide the desired range of movement. Suitable guards (not shown) can, of course, be provided on the device for the indicator 110.

It should be apparent that I have perfected a tool arm of greatly improved construction which obviates many of therproblems encountered with tool arms of other design.

It is to be understood that the drawings and descriptive matter are in all cases to be interpreted as merely illustrative of the principles of the invention rather than as limiting the same in any way, since it is contemplated that various changes may be made in the various elements to achieve like results without departing from the spirit of the invention or the scope of the appended claims.

I claim:

1. In a tool arm; support means for attachment to a machine tool frame opposite the spindle thereof; flexible bar means mounted thereon and having a resilientrpor- Y 7 tion deformable in an axial and radial direction; tool holdingrmeans on said `deformable portion; and means for selectively defer-ming said deformable portion axially and radially.

Z. In a tool arm; support means; holder carrying means thereon mounted for axial and radialV deformation rela-` tive thereto; holder means Vcarriedby said latter means; and meansrfor deforming said holder carrying means Vin either an axial or'a radial direction to move said holder means in independent directions axially or radially. f

3. The combination defined inclaim 2 in which saidV holder` carrying means fisv inpreloaded, deformed con# dition through its range of movement.v

v1'2."l`he combination ldefined in'claim l6 in means anda motion transmitting device including relatively adjustable parts to change the length of said device Y is connectedbetween said measuring meansand holde means to measure deflection thereof.

13.V In a tool arm; support means for attachmentto a,

i machine tool frame opposite the spindle thereof; holder 4. The combination defined in claim 2 inwhichdis'- i placeable measurement means is mounted on said support means in position to be displaced byV said holder carrying means. Y Y

5. The combination defined -in claim 2 in which displaceable measurement means is mounted onsaid support Y means imposition to be ydisplacedfby saidV means fork deforming said holder carrying means;

6. `In `a tool` arm; Vsupport means; a ja U-shaped slot therein with the legs thereof terminating 'adjacentk one` end of the bar inwenlarged side openings;

the slot Yand openings defining afcentral section "androuter section; means fory rigidly securingy one section lto Vsaid support means; a holder means carried by the other seci tion; andy means for deforming-said other section..

- releasably securing said portions in variousv relativeiaxial- Y positions.

flexible bar having y 7. The combination defined rin'rclaim 6 in'vvhich said central section is securedto said supportmeansl V3. The combination defined in'claim 6 inrwhich said side openings are transversely elongate'and delinerela-V tively thin, deformable walls with side portions of the Y flexible bar.

9. Thecombination defined in claim gin'which said section'Y secured to said supportfmeans is jgrooved Vand said means securing said section 'toi the support means exerts suicient force to'preload said section-vertically.

1t?. The'combination defined in claim 6 inrvvhichV said side openings arel relatively closely spaced to an endv portion of said flexible bar to define narrow,deformable walls between said end portion andopenings. i

. 11. The combination defined in claim 6in which said central portion is initially displaced `from ksaidouter section by deforming said flexible bar;

carryingk means thereon including a portion mounted for radial movement relative thereto. and a holder With-a tool thereon; movement measuring means; movement 5 transmission means including a portion adjustable in axial :length `relative to another portion between said `holder carrying Ameans andV movementameasuring Lmeans `for compensating for diierentjdistances from-theholder to the work engaging surface of the toolg-and-means for 14; VThe combination vdefined-.in claim 13 Vin u'hichsaid movement transmission'means includes telescoping parts.y

15; The combination defined. in claim` 13 jingwhich end andwreversible to vary the length'thereof trans;

vmitting movement to said one part.

16. The combination `defined in claim 151inrwhich'said other part has axially extending-splines on its upper and lower surfaces.

Y YReferences Cited bythe iraminer Y UNITED STATES IATEN'rs;

12/41 .'shutz. y 2,445,013 7/48 Winkler.

2,844,053 7/58 Wagner et al. 2,928,906 `3/60 Gernertas. 279-975 2,988,943 6/61 Tl'ibleY 82-.736 3,051,029 f V8/ 62 WILLIAM W. DYER; Pitman Examinar. Y JOHN C. CHRISTIE, LEON 'PE1-aa, Examiners.

which a" `displaceable measuringme'ans ismounted on said support 

1. IN A TOOL ARM; SUPPORT MEANS FOR ATTACHMENT TO A MACHINE TOOL FRAME OPPOSITE THE SPINDLE THEREOF; FLEXIBLE BAR MEANS MOUNTED THEREON AND HAVING A RESILIENT PORTION DEFORMABLE IN AN AXIAL AND RADIAL DIRECTION; TOOL HOLDING MEANS ON SAID DEFORMABLE PORTION; AND MEANS FOR SELECTIVELY DEFORMING SAID DEFORMABLE PORTION AXIALLY AND RADIALLY. 